aic7xxx_old.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

/*+M*************************************************************************
 * Adaptec AIC7xxx device driver for Linux.
 *
 * Copyright (c) 1994 John Aycock
 *   The University of Calgary Department of Computer Science.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
 * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
 * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
 * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
 * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
 * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
 * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
 * ANSI SCSI-2 specification (draft 10c), ...
 *
 * --------------------------------------------------------------------------
 *
 *  Modifications by Daniel M. Eischen ([e-mail]):
 *
 *  Substantially modified to include support for wide and twin bus
 *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
 *  SCB paging, and other rework of the code.
 *
 *  Parts of this driver were also based on the FreeBSD driver by
 *  Justin T. Gibbs.  His copyright follows:
 *
 * --------------------------------------------------------------------------  
 * Copyright (c) 1994-1997 Justin Gibbs.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Where this Software is combined with software released under the terms of 
 * the GNU General Public License ("GPL") and the terms of the GPL would require the 
 * combined work to also be released under the terms of the GPL, the terms
 * and conditions of this License will apply in addition to those of the
 * GPL with the exception of any terms or conditions of this License that
 * conflict with, or are expressly prohibited by, the GPL.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      $Id: aic7xxx.c,v 1.119 1997/06/27 19:39:18 gibbs Exp $
 *---------------------------------------------------------------------------
 *
 *  Thanks also go to (in alphabetical order) the following:
 *
 *    Rory Bolt     - Sequencer bug fixes
 *    Jay Estabrook - Initial DEC Alpha support
 *    Doug Ledford  - Much needed abort/reset bug fixes
 *    Kai Makisara  - DMAing of SCBs
 *
 *  A Boot time option was also added for not resetting the scsi bus.
 *
 *    Form:  aic7xxx=extended
 *           aic7xxx=no_reset
 *           aic7xxx=ultra
 *           aic7xxx=irq_trigger:[0,1]  # 0 edge, 1 level
 *           aic7xxx=verbose
 *
 *  Daniel M. Eischen, [e-mail], 1/23/97
 *
 *  $Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp $
 *-M*************************************************************************/

/*+M**************************************************************************
 *
 * Further driver modifications made by Doug Ledford <[e-mail]>
 *
 * Copyright (c) 1997-1999 Doug Ledford
 *
 * These changes are released under the same licensing terms as the FreeBSD
 * driver written by Justin Gibbs.  Please see his Copyright notice above
 * for the exact terms and conditions covering my changes as well as the
 * warranty statement.
 *
 * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 * but are not limited to:
 *
 *  1: Import of the latest FreeBSD sequencer code for this driver
 *  2: Modification of kernel code to accomodate different sequencer semantics
 *  3: Extensive changes throughout kernel portion of driver to improve
 *     abort/reset processing and error hanndling
 *  4: Other work contributed by various people on the Internet
 *  5: Changes to printk information and verbosity selection code
 *  6: General reliability related changes, especially in IRQ management
 *  7: Modifications to the default probe/attach order for supported cards
 *  8: SMP friendliness has been improved
 *
 * Overall, this driver represents a significant departure from the official
 * aic7xxx driver released by Dan Eischen in two ways.  First, in the code
 * itself.  A diff between the two version of the driver is now a several
 * thousand line diff.  Second, in approach to solving the same problem.  The
 * problem is importing the FreeBSD aic7xxx driver code to linux can be a
 * difficult and time consuming process, that also can be error prone.  Dan
 * Eischen's official driver uses the approach that the linux and FreeBSD
 * drivers should be as identical as possible.  To that end, his next version
 * of this driver will be using a mid-layer code library that he is developing
 * to moderate communications between the linux mid-level SCSI code and the
 * low level FreeBSD driver.  He intends to be able to essentially drop the
 * FreeBSD driver into the linux kernel with only a few minor tweaks to some
 * include files and the like and get things working, making for fast easy
 * imports of the FreeBSD code into linux.
 *
 * I disagree with Dan's approach.  Not that I don't think his way of doing
 * things would be nice, easy to maintain, and create a more uniform driver
 * between FreeBSD and Linux.  I have no objection to those issues.  My
 * disagreement is on the needed functionality.  There simply are certain
 * things that are done differently in FreeBSD than linux that will cause
 * problems for this driver regardless of any middle ware Dan implements.
 * The biggest example of this at the moment is interrupt semantics.  Linux
 * doesn't provide the same protection techniques as FreeBSD does, nor can
 * they be easily implemented in any middle ware code since they would truly
 * belong in the kernel proper and would effect all drivers.  For the time
 * being, I see issues such as these as major stumbling blocks to the 
 * reliability of code based upon such middle ware.  Therefore, I choose to
 * use a different approach to importing the FreeBSD code that doesn't
 * involve any middle ware type code.  My approach is to import the sequencer
 * code from FreeBSD wholesale.  Then, to only make changes in the kernel
 * portion of the driver as they are needed for the new sequencer semantics.
 * In this way, the portion of the driver that speaks to the rest of the
 * linux kernel is fairly static and can be changed/modified to solve
 * any problems one might encounter without concern for the FreeBSD driver.
 *
 * Note: If time and experience should prove me wrong that the middle ware
 * code Dan writes is reliable in its operation, then I'll retract my above
 * statements.  But, for those that don't know, I'm from Missouri (in the US)
 * and our state motto is "The Show-Me State".  Well, before I will put
 * faith into it, you'll have to show me that it works :)
 *
 *_M*************************************************************************/

/*
 * The next three defines are user configurable.  These should be the only
 * defines a user might need to get in here and change.  There are other
 * defines buried deeper in the code, but those really shouldn't need touched
 * under normal conditions.
 */

/*
 * AIC7XXX_STRICT_PCI_SETUP
 *   Should we assume the PCI config options on our controllers are set with
 *   sane and proper values, or should we be anal about our PCI config
 *   registers and force them to what we want?  The main advantage to
 *   defining this option is on non-Intel hardware where the BIOS may not
 *   have been run to set things up, or if you have one of the BIOSless
 *   Adaptec controllers, such as a 2910, that don't get set up by the
 *   BIOS.  However, keep in mind that we really do set the most important
 *   items in the driver regardless of this setting, this only controls some
 *   of the more esoteric PCI options on these cards.  In that sense, I
 *   would default to leaving this off.  However, if people wish to try
 *   things both ways, that would also help me to know if there are some
 *   machines where it works one way but not another.
 *
 *   -- July 7, 17:09
 *     OK...I need this on my machine for testing, so the default is to
 *     leave it defined.
 *
 *   -- July 7, 18:49
 *     I needed it for testing, but it didn't make any difference, so back
 *     off she goes.
 *
 *   -- July 16, 23:04
 *     I turned it back on to try and compensate for the 2.1.x PCI code
 *     which no longer relies solely on the BIOS and now tries to set
 *     things itself.
 */

#define AIC7XXX_STRICT_PCI_SETUP

/*
 * AIC7XXX_VERBOSE_DEBUGGING
 *   This option enables a lot of extra printk();s in the code, surrounded
 *   by if (aic7xxx_verbose ...) statements.  Executing all of those if
 *   statements and the extra checks can get to where it actually does have
 *   an impact on CPU usage and such, as well as code size.  Disabling this
 *   define will keep some of those from becoming part of the code.
 *
 *   NOTE:  Currently, this option has no real effect, I will be adding the
 *   various #ifdef's in the code later when I've decided a section is
 *   complete and no longer needs debugging.  OK...a lot of things are now
 *   surrounded by this define, so turning this off does have an impact.
 */
 
/*
 * #define AIC7XXX_VERBOSE_DEBUGGING
 */
 
#include <linux/module.h>
#include <stdarg.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <linux/version.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/blk.h>
#include <linux/tqueue.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/blk.h>
#include "sd.h"
#include "scsi.h"
#include "hosts.h"
#include "aic7xxx_old/aic7xxx.h"

#include "aic7xxx_old/sequencer.h"
#include "aic7xxx_old/scsi_message.h"
#include "aic7xxx_old/aic7xxx_reg.h"
#include <scsi/scsicam.h>

#include <linux/stat.h>
#include <linux/slab.h>        /* for kmalloc() */

#include <linux/config.h>        /* for CONFIG_PCI */

/*
 * To generate the correct addresses for the controller to issue
 * on the bus.  Originally added for DEC Alpha support.
 */
#define VIRT_TO_BUS(a) (unsigned int)virt_to_bus((void *)(a))

#define AIC7XXX_C_VERSION  "5.2.4"

#define NUMBER(arr)     (sizeof(arr) / sizeof(arr[0]))
#define MIN(a,b)        (((a) < (b)) ? (a) : (b))
#define MAX(a,b)        (((a) > (b)) ? (a) : (b))
#define ALL_TARGETS -1
#define ALL_CHANNELS -1
#define ALL_LUNS -1
#define MAX_TARGETS  16
#define MAX_LUNS     8
#ifndef TRUE
#  define TRUE 1
#endif
#ifndef FALSE
#  define FALSE 0
#endif

#if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__)
#  define MMAPIO
#endif

#  if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,95)
#    define cpuid smp_processor_id()
#    define DRIVER_LOCK_INIT \
       spin_lock_init(&p->spin_lock);
#    define DRIVER_LOCK \
       if(!p->cpu_lock_count[cpuid]) { \
         spin_lock_irqsave(&p->spin_lock, cpu_flags); \
         p->cpu_lock_count[cpuid]++; \
       } else { \
         p->cpu_lock_count[cpuid]++; \
       }
#    define DRIVER_UNLOCK \
       if(--p->cpu_lock_count[cpuid] == 0) \
         spin_unlock_irqrestore(&p->spin_lock, cpu_flags);
#  else
#    define DRIVER_LOCK_INIT
#    define DRIVER_LOCK
#    define DRIVER_UNLOCK
#  endif

/*
 * You can try raising me if tagged queueing is enabled, or lowering
 * me if you only have 4 SCBs.
 */
#ifdef CONFIG_AIC7XXX_OLD_CMDS_PER_DEVICE
#define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_OLD_CMDS_PER_DEVICE
#else
#define AIC7XXX_CMDS_PER_DEVICE 32
#endif

/*
 * Control collection of SCSI transfer statistics for the /proc filesystem.
 *
 * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 * NOTE: This does affect performance since it has to maintain statistics.
 */
#ifdef CONFIG_AIC7XXX_OLD_PROC_STATS
#define AIC7XXX_PROC_STATS
#endif

/*
 * *** Determining commands per LUN ***
 * 
 * When AIC7XXX_CMDS_PER_DEVICE is not defined, the driver will use its
 * own algorithm to determine the commands/LUN.  If SCB paging is
 * enabled, which is always now, the default is 8 commands per lun
 * that indicates it supports tagged queueing.  All non-tagged devices
 * use an internal queue depth of 3, with no more than one of those
 * three commands active at one time.
 */